package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @author 安贺
 * @createTime 2022年08月30日 16:08:00
 * @description
 */
@Component
public class RedisIdWorker {

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640998800L;
    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1 获取当前日期，精确到天 ,
        //2.2自增长
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //拼接并返回
        return timeStamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime of = LocalDateTime.of(2022, 1, 1, 1, 0, 0);
        long l = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println(l);
    }

}
